Dresden 2017 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 32: Microstructure and Phase Transformations - detection methods
MM 32.2: Vortrag
Dienstag, 21. März 2017, 12:00–12:15, IFW B
Time resolved diffraction on cooling of Ti-Fe alloys solidified from different undercooling levels — •Olga Shuleshova1, Ivan Kaban1, Dirk Holland-Moritz2, Jan Gegner2, Junhee Han1, Norbert Mattern1, and Jürgen Eckert3 — 1Institute for Complex Materials, IFW Dresden, Germany — 2Institute of Materials Physics in Space, DLR, Cologne, Germany — 3Montan-University Leoben, Austria
Melt undercooling is a necessary precondition to begin solidification. With help of the containerises processing, realised in different levitation techniques, undercoolings of the order of several hundreds degrees are easily achieved in many pure metals as well as in metallic alloy systems. With increasing undercooling a profound effect of solute trapping have been observed in alloys. Time resolved diffraction of synchrotron X-rays on levitated metallic droplets allows to quantitatively analyse the level of supersaturation present in the sample immediately after solidification and trace its further evolution as sample is cooled down. Applied to the Ti-Fe system this method have shown a non-intuitive results due to coupling with other effect of undercooling - the microstructure refinement. Financial support by DFG under project No. SH 578/1-1 is gratefully acknowledged.